The best answer is either A or B, depending upon the emphasis placed on this dissolution by the text book author.

There wasn't overt conflict in eastern Europe because the USSR put down any attempts at rebellion. Many nations in the world were affected because it announced that the Cold War was over and the USSR was no longer threatening the western world.

History/Geography - What impact did the dissolution of the Union of Soviet ...
Geography/History - Multiple select. The dissolution of the Union of Soviet ...
world geography - What impact did the dissolution of the Union of Soviet ...
geography - What impact did the dissolution of the Union of Soviet Socialist ...
us history - After World War II, the United States offered aid to the nations of...
U.S History - After World War II, the United States offered aid to the nations ...
Geography (Ms. Sue) - 1). How did the Reformation affect Northern Europe? A: The...
Geography (Ms. Sue) - 1). Where are most of the region's (Russia and the ...
Geography - Is this correct? 20. Communist governments in Eastern Europe were ...
Geography - It has been said that Eastern Europe is a political region more than...